1Password Access after Death, Legacy Contacts

Having skimmed through the white paper I don’t understand what is the problem with implementing the following scheme:

Assigning an inactivity period to a vault and a next of kin assignee who is part of the team/family.

Example of work flow:

1) Alice creates a family and shares with Bob their every day activities in a shared Vault
2) Either Alice or Bob invite their executor and lawyer Lawrence to their family. Perhaps even as a guest.
3) Lawrence signs up and creates his own profile along with secret key and account password
4) Lawrence is initially not given access to any vaults.
5) Alice assigns Lawrence as the next of kin on the “Shared” vault she and Bon share.
6) Alice chooses an inactivity period on that vault of 180 days. Thinking even a prolonged hospital visit of her’s where Bob is still alive and functioning and caring for her needs shouldn’t have him out of his 1Password daily activities for more than 180 days.

… after 180 days of inactivity
7) 1Password service does the same thing it would normally do to share the vault with Lawrence. The vault key is encrypted with Lawrence’s public key and he is granted access to the items in it.

Why is such a scheme so hard to implement? There is definitely no lack of interest and need for this feature.

EDIT: mildly infuriating is that this scheme is available today with a business account (for the event logs feature) and a kiddy script using 1Password CLI running on any cloud server or a few of them as the action itself is idempotent.